Read ruby "configuration" script using instance_eval.

app-config.rb

module Configuration

  def self.configured_components
    @components
  end

  def self.component(key)  
    return unless block_given?    
    @components ||= {}    
    @components[key] = yield    
  end    
end

Configuration.instance_eval(DATA.read)

require 'pp'
pp Configuration.configured_components

__END__

# configure foo component
component(:foo) do
  :bar
end

# configure bar component
component(:bar) do
  :baz
end